490 Micro GC Natural Gas Analyzer

490 Micro GC Natural Gas Analyzer
Agilent 490
Micro GC Natural Gas
Analyzer
User Manual
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2012
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Manual Part Number
G3582-90002
Edition
First edition, May 2012
Printed in USA
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Contents
1
Agilent 490 Micro GC - Natural Gas Analyzers
Introduction
5
Types of Agilent 490 Micro GC - Natural Gas Analyzers
5
Agilent 490 Micro GC - Natural Gas Analyzer A and the Extended
Version 6
Natural Gas Analyzer A 6
Natural Gas Analyzer A Extended 6
Agilent 490 Micro GC - Natural Gas Analyzer B and the Extended
Version 7
Natural Gas Analyzer B 7
Natural Gas Analyzer B Extended 7
2
Checkout Information
Introduction
8
Natural Gas Analyzer A and the A Extended Version
HayeSep A straight 10
6 meter CP-Sil 5 CB 11
HayeSep A backflush 13
4 meter CP-Sil 5 CB 14
8 meter CP-Sil 5 CB 16
Natural Gas Analyzer B and B Extended Version
PoraPLOT U 18
6 meter CP Sil 5 CB 20
CP-Molsieve 5A 22
3
10
18
Tuning the Backflush Time
Tuning the Backflush Time on CP-Molsieve 5A, PoraPLOT U, or CP-Sil 5
CB 24
Tuning procedure for the backflush time 24
Tuning the Backflush Time on a HayeSep A 26
Tuning procedure for HayeSep A channel 26
Natural Gas Analyzer
3
A
Appendix A: Certificate of the NGA Gas Calibration Standard
B
Appendix B: Certificate of the Universal Gas Calibration Standard
C
Appendix C: Typical Method Settings for Natural Gas Analyzers
D
Appendix D: Carrier Gas Type Configuration
Procedure to Change the Carrier Gas Type
E
Natural Gas Analyzer
32
Appendix E: Method for CP-Molsieve 5A Channel with Carrier Gas Argon
4
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
1
Agilent 490 Micro GC - Natural Gas
Analyzers
Introduction
Natural gas is a fossil fuel. Millions of years ago, the remains of
plants, animals, and micro-organisms were buried underneath
layers of soil and sediment. Due to the weight of the soil and
sediment, the pressure and temperature increased. This
resulted in the slow transformation of the organisms into
natural gas and oil.
The composition of natural gas varies widely. Natural gas is a
combustible mixture of hydrocarbon gases that mainly consists
of methane, smaller amounts of light hydrocarbons such as
ethane, propane, n-butane, n-pentane, hexanes plus, and other
gases such as nitrogen, carbon dioxide, oxygen, hydrogen, and
hydrogen sulfide. Natural gas can also contain traces of argon,
helium, neon, and xenon. Natural gas in its pure form is
colorless and odorless.
Natural Gas Analyzers have been designed to analyze the
different compositions of natural gas.
Types of Agilent 490 Micro GC - Natural Gas Analyzers
The following four types of Natural Gas Analyzers can be used
to analyze natural gas:
• The Agilent 490 Micro GC - Natural Gas Analyzer A
• The Agilent 490 Micro GC - Natural Gas Analyzer A Extended
• The Agilent 490 Micro GC - Natural Gas Analyzer B
• The Agilent 490 Micro GC - Natural Gas Analyzer B Extended
Agilent Technologies
5
Agilent 490 Micro GC - Natural Gas Analyzers
1
Agilent 490 Micro GC - Natural Gas Analyzer A and the Extended Version
Natural Gas Analyzer A
The Agilent 490 Micro GC - Natural Gas Analyzer A is used to
analyze natural gas samples containing methane, carbon
dioxide, and hydrocarbons up to n-nonane.
The Agilent 490 Micro GC - Natural Gas Analyzer A is a dual
cabinet micro GC equipped with two channels:
• HayeSep A channel (straight)
• 6 meter CP-Sil 5 CB channel
Natural Gas Analyzer A Extended
The Agilent 490 Micro GC - Natural Gas Analyzer A Extended is
used to analyze methane, carbon dioxide, and hydrocarbons up
to n-dodecane.
The Agilent 490 Micro GC - Natural Gas A Extended is a quad
cabinet micro GC equipped with three channels:
• HayeSep A channel with a backflush option
• 4 meter CP-Sil 5 CB channel with a backflush option
• 8 meter CP-Sil 5 CB channel
Natural Gas Analyzers
6
Agilent 490 Micro GC - Natural Gas Analyzers
1
Agilent 490 Micro GC - Natural Gas Analyzer B and the Extended Version
Natural Gas Analyzer B
The Agilent 490 Micro GC - Natural Gas Analyzer B is used to
analyze methane, carbon dioxide, hydrogen sulfide, and light
hydrocarbons up to n-nonane in natural gas.
The Agilent 490 Micro GC - Natural Gas Analyzer B is a dual
cabinet micro GC equipped with two channels:
• PoraPLOT U channel with a backflush option
• 6 meter CP-Sil 5 CB channel
Natural Gas Analyzer B Extended
The Agilent 490 Micro GC - Natural Gas Analyzer B Extended is
used to analyze hydrogen, nitrogen, oxygen, methane, carbon
dioxide, carbon monoxide, hydrogen sulfide, and hydrocarbons
up to n-nonane.
The Agilent 490 Micro GC - Natural Gas Analyzer B Extended is
a quad cabinet micro GC equipped with three channels:
• CP-Molsieve 5A channel with a backflush option
• PoraPLOT U channel with a backflush option
• 6 meter CP-Sil 5 CB channel
The Natural Gas Analyzer B Extended version is equipped with
a dual carrier gas option for the CP-Molsieve 5A channel. It is
made flexible for analysis of hydrogen and helium on the
CP-Molsieve 5A channel if required. For the analysis of helium
on the CP-Molsieve 5A channel, the carrier gas must be argon.
All analyzers are factory tuned on carrier gas helium.
Before starting up the Agilent 490 Micro GC - Natural Gas
Analyzer, ensure that correct carrier gases are connected for all
channels. For all types of analyzers, the required carrier gas is
helium. However, to analyze helium on the CP-Molsieve 5A, the
carrier gas must be argon. The required pressure for carrier gas
is 550 kPa (80 psi). For more information on the Agilent 490
Micro GC, see the Agilent 490 Micro GC User Manual.
Natural Gas Analyzers
7
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
2
Checkout Information
Introduction
The Agilent 490 Micro GC - Natural Gas Analyzers are factory
tuned on carrier gas helium including appropriate settings for
back flush times for the following channels:
• HayeSep A
• 4 meter CP-Sil 5 CB
• CP-Molsieve 5A
• PoraPLOT U
The final checkout of the Agilent 490 Micro GC - Natural Gas
Analyzer is performed with a NGA Gas Calibration standard
and a Universal Gas Calibration standard.
• The NGA Gas Calibration standard contains nitrogen,
methane, ethane, carbon dioxide, propane, iso-butane,
n-butane, iso-pentane, n-pentane, and n-hexane. This natural
gas standard does not contain all components specified for
each type of Natural Gas Analyzer. Therefore, a second
checkout sample, the Universal Gas Calibration standard is
analyzed on the Natural Gas Analyzer.
• The Universal Gas Calibration standard contains helium,
neon, hydrogen, oxygen, nitrogen, methane, ethane, ethylene,
carbon dioxide, carbon monoxide, acetylene, propane,
methyl acetylene, n-butane, n-hexane, and n-heptane. Not all
components in the Universal Gas Calibration standard are
specified for the Natural Gas Analyzer.
Agilent Technologies
8
Checkout Information
2
More detailed information about the NGA Gas Calibration
standard and the Universal Gas Calibration standard can be
found in Appendix A on page 27 and Appendix B on page 28.
The components specified for each channel are described in
“Agilent 490 Micro GC - Natural Gas Analyzer A and the
Extended Version” on page 6 and “Agilent 490 Micro GC Natural Gas Analyzer B and the Extended Version” on page 7.
The NGA Gas Calibration standard and the Universal Gas
Calibration standard are shipped with the analyzer and used by
the Agilent Customer Engineer at installation. The factory
tuned method, final chromatogram (Test Report), and the
Natural Gas Analyzer User Manual are supplied on the Analyzer
CD.
To perform reference checks on the analyzer, use the NGA Gas
Calibration standard or the Universal Gas Calibration standard.
If OpenLAB CDS EZChrom is used, load the method from the
analyzer CD or create a method using the settings from the
method pdf-file available on the analyzer CD. For a quick start,
see the method settings for Natural Gas Analyzers listed in
Appendix C on page 29. Connect and inject the NGA Gas
Calibration standard.
To analyze helium on the CP-Molsieve 5A channel, use the
Universal Gas Calibration standard for the checkout. Ensure
that the carrier gas argon is supplied and configured before
starting the analysis. For more information on how to configure
the carrier gas for the analyzer see Appendix D on page 31.
Method settings for this analysis can be found in Appendix E on
page 35.
The NGA Gas Calibration standard and the Universal Gas
Calibration standard do not contain hydrogen sulfide. A
reference chromatogram of hydrogen sulfide is included in this
manual.
Natural Gas Analyzers
9
2
Checkout Information
Natural Gas Analyzer A and the A Extended Version
HayeSep A straight
The HayeSep A channel of the Natural Gas Analyzer A is
specified for the analysis of methane, carbon dioxide, ethane,
and propane.
Analysis of the NGA Gas Calibration standard results in the
chromatogram shown in Figure 1.
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 2
Nitrogen
300
250
150
Methane
50
0
0
10
Propane
100
Ethane
Carbon Dioxide
mV
200
20
30
40
50
60
70
80
90
100
Seconds
Figure 1
NGA Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A
.
Nitrogen
12
10
Propane
Acetylene
2
Ethane
Methane
4
Ethylene
6
Carbon Dioxide
mV
8
0
0
Figure 2
10
20
30
40
50
Seconds
60
70
80
90
100
Universal Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A
Natural Gas Analyzers
10
Checkout Information
2
6 meter CP-Sil 5 CB
The 6 meter CP-Sil 5 CB channel of the Natural Gas Analyzer A
is specified for the analysis of light hydrocarbons from propane
up to n-nonane.
Analysis of the NGA Gas Calibration standard results in a
chromatogram similar to Figure 3.
500
n-Propane
Ethane
Analysis of a sample containing neo-pentane results in a
chromatogram similar to Figure 4.
n-Hexane
100
i-Pentane
n-Butane
200
n-Pentane
300
i-Butane
mV
400
0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
Seconds
NGA Gas Calibration standard analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer A
Ethane
Figure 3
Propane
500
n-Hexane
n-Pentane
i-Pentane
100
neo-Pentane
200
n-Butane
300
i-Butane
mV
400
0
10.0
Figure 4
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
32.5
Seconds
35.0
37.5
40.0
42.5
45.0
47.5
50.0
52.5
Sample containing neo-pentane analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer A
Natural Gas Analyzers
11
2
Checkout Information
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 5.
Analysis of a sample containing heavier hydrocarbons up to
n-nonane results in a chromatogram similar to Figure 6.
Propane
If a sample contains hydrocarbons up to n-nonane ensure that
the total run time is increased sufficiently to detect all
hydrocarbons on this channel.
10.0
n-Heptane
2.5
n-Hexane
i-Butane
5.0
n-Butane
mV
7.5
0.0
10
30
40
50
Seconds
60
70
80
90
Universal Gas Calibration standard analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer A
Propane
Figure 5
20
30
n-Nonane
n-Octane
n-Heptane
10
n-Hexane
n-Pentane
mV
n-Butane
20
0
0
Figure 6
50
100
150
200
Seconds
250
300
350
400
Sample containing hydrocarbons up to n-nonane analyzed with the 6 meter CP-Sil 5 CB channel on
Analyzer A
Natural Gas Analyzers
12
2
Checkout Information
HayeSep A backflush
The HayeSep A channel, with backflush option, of the Natural
Gas Analyzer A Extended is specified for the analysis of
methane, carbon dioxide, ethane, and propane.
Analysis of the NGA Gas Calibration standard results in the
chromatogram shown in Figure 7.
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 8.
Nitrogen
0
0
20
30
40
50
60
70
Seconds
80
90
100
110
120
130
140
150
NGA Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A Extended
Methane
Figure 7
10
Propane
Methane
50
Ethane
100
Carbon Dioxide
mVolt
150
Propane
Acethylene
9
Ethane
Carbon Dioxide
10
Ethylene
Nitrogen
mVolt
11
8
0
10
20
30
40
50
60
70
80
90
100
110
Seconds
Figure 8
Universal Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A Extended
Natural Gas Analyzers
13
2
Checkout Information
4 meter CP-Sil 5 CB
The 4 meter CP-Sil 5 CB channel of the Natural Gas Analyzer A
Extended is specified for the analysis of light hydrocarbons
propane, n-butane, iso-butane, iso-pentane, and n-pentane.
Analysis of the NGA Gas Calibration standard results in the
chromatogram shown in Figure 9.
Analysis of a sample containing neo-pentane results in a
chromatogram similar to Figure 10.
Ethane
i-Pentane
50
n-Butane
i-Butane
100
n-Pentane
Propane
mVolt
150
0
8
12
16
18
20
Seconds
22
24
26
28
30
32
34
NGA Gas Calibration standard analyzed with the 4 meter CP-Sil 5 CB channel on Analyzer A Extended
n-Pentane
50
i-Pentane
i-Butane
100
neo-Pentane
150
n-Butane
Propane
200
mVolt
14
Ethane
Figure 9
10
0
10
12
14
16
18
20
Seconds
22
24
26
28
30
32
Figure 10 Sample containing neo-pentane analyzed with the 4 meter CP-Sil 5 CB channel on Analyzer A
Extended
Natural Gas Analyzers
14
2
Checkout Information
Analysis of the Universal Gas Calibration standard results in
the chromatogram shown in Figure 11.
15.0
i-Butane
5.0
n-Butane
7.5
Propane
10.0
Ethane
mVolt
12.5
2.5
0.0
10
11
12
13
14
15
16
Seconds
17
18
19
20
21
22
Figure 11 Universal Gas Calibration standard analyzed with the 4 meter CP-Sil 5 CB channel on Analyzer
A Extended
Natural Gas Analyzers
15
2
Checkout Information
8 meter CP-Sil 5 CB
The 8 meter CP-Sil 5 CB channel of the Natural Gas Analyzer A
Extended is used for the analysis of hydrocarbons from
n-hexane up to n-dodecane.
The NGA Gas Calibration standard and the Universal Gas
Calibration standard do not contain heavy hydrocarbons up to
n-dodecane. Reference chromatograms of the NGA Gas
Calibration standard and the Universal Gas Calibration
standard are included in this manual. For heavy hydrocarbons
up to n-dodecane an additional sample is analyzed for
identification.
Analysis of the NGA Gas Calibration standard results in the
chromatogram shown in Figure 12.
Reference check of the Universal Gas Calibration standard
results in a chromatogram similar to Figure 13.
10
n-Hexane
mV
15
5
0
15
20
25
30
35
Seconds
40
45
50
55
Figure 12 NGA Gas Calibration standard analyzed with the 8 meter CP-Sil 5 CB channel on Analyzer A Extended
5.0
2.5
n-Heptane
n-Hexane
mV
7.5
0.0
15
20
25
30
35
Seconds
40
45
50
55
Figure 13 Universal Gas Calibration standard analyzed with the 8 meter CP-Sil 5 CB channel on Analyzer
A Extended
Natural Gas Analyzers
16
2
Checkout Information
Analysis of a sample containing heavier hydrocarbons up to
n-decane results in the chromatogram shown in Figure 14.
Analysis of a sample that contains heavier hydrocarbons up to
n-dodecane results in a chromatogram similar to Figure 15.
0.6
0.4
n-Decane
mV
0.8
n-Nonane
1.0
n-Octane
n-Heptane
1.2
0.2
0.0
10
20
30
40
50
60
Seconds
70
80
90
100
110
0.5
20
40
60
80
n-Undecane
n-Decane
1.0
100
120
Seconds
140
n-Dodecane
mV
n-Nonane
1.5
n-Octane
n-Hexane
2.0
n-Heptane
Figure 14 Hydrocarbon gas mix containing n-heptane to n-decane analyzed with the 8 meter CP-Sil 5 CB
channel on Analyzer A Extended
160
180
200
220
Figure 15 Hydrocarbon gas mix containing n-hexane to n-dodecane analyzed with the 8 meter CP-Sil 5 CB
channel on Analyzer A Extended
Natural Gas Analyzers
17
Checkout Information
2
Natural Gas Analyzer B and B Extended Version
PoraPLOT U
The PoraPLOT U channel of the Agilent 490 Micro GC - Natural
Gas Analyzer B and Extended version is specified for the
analysis of methane, carbon dioxide, ethane, hydrogen sulfide,
and propane in natural gas samples. The total sample path of
this channel is deactivated (Ultimetal), which results in better
performance and peak shape for hydrogen sulfide.
400
Nitrogen
Methane
Analysis of the NGA Gas Calibration standard results in a
chromatogram similar to Figure 16.
100
Propane
Carbon Dioxide
200
Ethane
mV
300
0
20
25
30
35
40
45
50
55
60
65
Seconds
Figure 16 NGA Gas Calibration standard analyzed with the PoraPLOT U channel on Analyzer B
Natural Gas Analyzers
18
2
Checkout Information
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 17.
Analysis of a sample containing hydrogen sulfide results in a
chromatogram similar to Figure 18.
Propane
Acetylene
Ethane
Ethylene
Carbon Dioxide
10
Methane
mV
Nitrogen
20
0
20
25
30
35
40
45
50
55
60
65
Seconds
Propane
Hydrogen Sulfide
25
Nitrogen
mV
50
Ethane
75
Carbon Dioxide
Methane
Figure 17 Universal Gas Calibration standard analyzed with the PoraPLOT U channel on Analyzer B
0
20
25
30
35
40
45
50
55
60
65
Seconds
Figure 18 Sample containing hydrogen sulfide analyzed with the PoraPLOT U channel on Analyzer B
Natural Gas Analyzers
19
2
Checkout Information
6 meter CP Sil 5 CB
The 6 meter CP-Sil 5 CB channel of the Natural Gas Analyzer B
and the B Extended is specified for the analysis of
hydrocarbons from propane to n-nonane.
Analysis of the NGA Gas Calibration standard results in the
chromatogram shown in Figure 19.
500
n-Propane
Ethane
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 20.
n-Hexane
n-Pentane
100
i-Pentane
200
n-Butane
300
i-Butane
mV
400
0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
Seconds
Figure 19 NGA Gas Calibration standard analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer B
Propane
.
10.0
n-Heptane
2.5
n-Hexane
i-Butane
5.0
n-Butane
mV
7.5
0.0
10
20
30
40
50
Seconds
60
70
80
90
Figure 20 Universal Gas Calibration standard analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer B
Natural Gas Analyzers
20
2
Checkout Information
Analysis of a sample containing neo-pentane results in a
chromatogram similar to Figure 21.
Analysis of a sample containing hydrocarbons up to n-nonane
results in a chromatogram similar to Figure 22.
Ethane
For samples that contain hydrocarbons up to n-nonane,
increase the total run time to detect all hydrocarbons on this
channel.
Propane
500
400
n-Hexane
n-Pentane
i-Pentane
100
n-Butane
200
neo-Pentane
i-Butane
mV
300
0
15.0
10.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
Seconds
Propane
Figure 21 Sample containing neo-pentane analyzed with the 6 meter CP-Sil 5 CB channel on Analyzer B
30
n-Nonane
n-Octane
n-Heptane
10
n-Hexane
n-Pentane
mV
n-Butane
20
0
0
50
100
150
200
Seconds
250
300
350
400
Figure 22 Sample containing hydrocarbons up to n-nonane analyzed with the 6 meter CP-Sil 5 CB channel on
Analyzer B
Natural Gas Analyzers
21
2
Checkout Information
CP-Molsieve 5A
The CP-Molsieve 5A channel of the Natural Gas Analyzer B
Extended is used for the analysis of permanent gases such as
hydrogen, oxygen, nitrogen, methane, and carbon monoxide.
Analysis of the NGA Gas Calibration standard results in a
chromatogram similar to Figure 23.
Analysis of the Universal Gas Calibration results in the
chromatogram shown in Figure 24.
Oxygen
15
mV
10
Nitrogen
Neon
0
10
Methane
5
15
20
25
30
35
Seconds
40
45
50
55
60
Nitrogen
Figure 23 NGA Gas Calibration standard analyzed with the CP-Molsieve 5A channel on Analyzer B Extended
12.5
7.5
2.5
0.0
10
15
20
Methane
Neon
Hydrogen
5.0
Carbon Monoxide
Oxygen
mV
10.0
25
30
35
40
45
50
55
Seconds
60
65
70
75
80
85
90
95
Figure 24 Universal Gas Calibration standard analyzed with the CP-Molsieve 5A channel on Analyzer B
Extended
Natural Gas Analyzers
22
2
Checkout Information
CA U TI O N
The CP-Molsieve 5A channel is factory tuned on carrier gas helium.
If analysis of helium or hydrogen is required on the CP-Molsieve 5A
channel, the carrier gas must be changed and configured for argon.
The procedure for configuring the carrier gas in OpenLAB CDS
EZChrom is described in Appendix D on page 31.
Hydrogen
Analysis of the Universal Gas Calibration standard results in a
chromatogram similar to Figure 25.
8
0
20
30
40
Carbon Monoxide
Methane
Neon
2
Oxygen
4
Nitrogen
Helium
mV
6
50
60
70
80
90
100
110
Seconds
Figure 25 Universal Gas Calibration standard analyzed with the CP-Molsieve 5A channel on Analyzer B
Extended
Natural Gas Analyzers
23
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
3
Tuning the Backflush Time
Tuning the Backflush Time on CP-Molsieve 5A, PoraPLOT U, or CP-Sil 5 CB
Tuning the backflush time is necessary for each new
CP-Molsieve 5A channel, PoraPLOT U channel, and 4 meter
CP-Sil 5 CB channel. This chapter describes how to tune the
backflush time for these channels.
• The goal for tuning the CP-Molsieve 5A is to get all methane
on the column while later-eluting components such as
moisture, carbon dioxide, ethane, and higher hydrocarbons
are backflushed.
• The PoraPLOT U is tuned on the propane peak while all other
components that elute after propane are backflushed.
• The 4 meter CP-Sil 5 CB is tuned on the n-pentane while all
other hydrocarbons that elutes after n-pentane are
backflushed.
Tuning procedure for the backflush time
1
Set the backflush time to 0 seconds and analyze the
checkout sample or a proper sample for the specific channel.
The goal of this is to identify the components in the
calibration standard.
2
Change the backflush time to 10 seconds and perform a run.
The following can be observed:
• When the backflush time is set too early, the peaks of
interest are partially or totally backflushed.
• If the backflush time is set too late, the unwanted
components are not backflushed and show up in the
chromatogram.
3
Perform runs with different backflush times until there is no
huge difference in the peak of interest. To fine tune the
backflush time, set smaller steps (for example 0.10 seconds)
until you find the optimal backflush time.
Agilent Technologies
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Tuning the Backflush Time
3
Figure 26 shows a simple example of tuning the backflush time
for the CP-Molsieve 5A channel.
Area_peak of interest
Tuning backflush for CP-Molsieve channel
9
10
11
12
13
Backflush me (s)
Figure 26 Effect of the backflush time on the peak of interest
Natural Gas Analyzers
25
3
Tuning the Backflush Time
Tuning the Backflush Time on a HayeSep A
For each new HayeSep A channel, with a backflush option, it is
necessary to tune the backflush time properly. The tuning
procedure of the HayeSep A channel is different than the tuning
procedure of a CP-Molsieve 5A, PoraPLOT U, or 4 meter CP-Sil 5
CB channel.
This section describes how to tune the backflush time for the
HayeSep A channel. The goal for tuning the HayeSep A channel
is get all peaks of interest, components up to propane, on the
HayeSep A column while all unwanted peaks that elute after
propane are backflushed.
Tuning procedure for HayeSep A channel
1
Set the backflush time of the HayeSep A channel to 0 seconds.
2
Set an appropriate run time for the first analysis (for
example 300 seconds or longer).
3
Analyze the NGA Gas Calibration standard and identify all
components in the calibration standard.
4
When all peaks of interest are identified, select a proper
backflush time after propane peak.
Figure 27 shows an example of the tuning procedure of
HayeSep A channel. In this example the propane peak elutes
around 90 seconds, proper backflush time for the HayeSep A
here is around 120 seconds.
Consider that the total run time must be sufficient to backflush
all unwanted components from the column. The ideal total run
time is approximately twice the backflush time or higher. So in
this example, a total run time of 240 seconds is sufficient to
backflush all unwanted components from the HayeSep A channel.
100
Peaks of Interest
10
20
30
40
50
60
70
80
90
Seconds
i--Butane
Ethane
Unwanted Peak
Propane
20
Methane
40
Carbon Dioxide
60
Nitrogen
mVolt
80
Appropriate
Backflush Time
100
110
120
130
140
150
160
170
Figure 27 Selecting backflush time for a HayeSep A channel
Natural Gas Analyzers
26
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
Appendix A: Certificate of the NGA Gas
Calibration Standard
Part number: 5184-3536
Agilent Technologies
27
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
Appendix B: Certificate of the Universal
Gas Calibration Standard
Part number 5184-3541
Agilent Technologies
28
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
Appendix C: Typical Method Settings
for Natural Gas Analyzers
Typical method settings for the Natural Gas Analyzers are given
in Tables 1 - 4.
Table 1
Method for Agilent 490 Micro GC - Natural Gas Analyzer A
Method settings*
HayeSep A
CP-Sil 5 CB_6m
Carrier gas
Helium
Helium
Injector temperature (°C)
110
110
Injection time (ms)
40
40
Column temperature (°C)
60
70
Pressure (kPa)
260
150
Sample line temperature (°C) 110
110
* For more details of the method, see the pdf-method file available on the Natural Gas
Analyzer CD.
Table 2
Method for Agilent 490 Micro GC - Natural Gas Analyzer A Extended
Method settings*
HayeSep A
CP-Sil 5 CB_4m
CP-Sil 5 CB_8m
Carrier gas
Helium
Helium
Helium
Injector temperature (°C)
110
110
110
Injection time (ms)
20
40
40
Backflush time (s)†
120
12
-
Column temperature (°C)
90
60
150
Pressure (kPa)
340
150
200
Sample line temperature (°C)
110
110
110
* For more details of the method, see the pdf-method file available on the Natural Gas Analyzer CD.
† The backflush time must be tuned for each new CP-Molsieve 5A, PoraPLOT U, 4 meter CP-Sil 5 CB, and HayeSep A channel.
Agilent Technologies
29
Appendix C: Typical Method Settings for Natural Gas Analyzers
Table 3
Method for Agilent 490 Micro GC - Natural Gas Analyzer B
Method settings*
PoraPLOT U
CP-Sil 5 CB_6m
Carrier gas
Helium
Helium
Injector temperature (°C)
110
110
Injection time (ms)
40
40
Backflush time (s)†
17
-
Column temperature (°C)
60
70
Pressure (kPa)
175
150
Sample line temperature (°C)
110
110
* For more details of the method, see the pdf-method file available on the Natural Gas
Analyzer CD.
† The backflush time must be tuned for each new CP-Molsieve 5A, PoraPLOT U,
4 meter CP-Sil 5 CB, and HayeSep A channel.
Table 4
Method for Agilent 490 Micro GC - Natural Gas Analyzer B Extended
Method settings*
CP-Molsieve 5A
PoraPLOT U
CP-Sil 5 CB_6m
Carrier gas
Helium
Helium
Helium
Injector temperature (°C)
110
110
110
Injection time (ms)
40
40
40
Backflush time (s)†
11
17
-
Column temperature (°C)
80
60
70
Pressure (kPa)
200
175
150
Sample line temperature (°C)
110
110
110
* For more details of the method, see the pdf-method file available on the Natural Gas Analyzer CD.
† The backflush time must be tuned for each new CP-Molsieve 5A, PoraPLOT U, 4 meter CP-Sil 5 CB, and HayeSep A channel.
Natural Gas Analyzers
30
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
Appendix D: Carrier Gas Type
Configuration
The Agilent 490 Micro GC - Natural Gas Analyzers are factory
tuned using the carrier gas helium. When analysis of helium is
required, the carrier gas must be changed to argon.
Instruments with the dual carrier option are typically
configured as shown in Figure 28.
Natural Gas Analyzer B Extended, quad channel cabinet
Channel 1
Channel 2
Channel 3
Channel 4
MolSieve 5A
PoraPLOT U
CP-Sil 5 CB
Empty slot
Carrier gas 2
Carrier gas 1
Figure 28 Typical configuration of a dual carrier instrument
Agilent Technologies
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Appendix D: Carrier Gas Type Configuration
Procedure to Change the Carrier Gas Type
If you are using Agilent OpenLAB CDS EZChrom edition, use
the following procedure to change the carrier gas type.
1
In the Agilent OpenLAB Control Panel Navigation pane,
select the instrument.
2
In the Actions toolbar, select Configure Instrument. See
Figure 29.
Figure 29 OpenLAB Control Panel
Natural Gas Analyzers
32
Appendix D: Carrier Gas Type Configuration
3
Double-click Agilent 490 Micro GC. See Figure 30.
Figure 30 Configuration window Agilent 490 Micro GC
4
In the EZChrom Configuration dialog box, select the
Instrument configuration tab.
5
In the Carrier gas list, select Argon. See Figure 31.
Figure 31 The Instrument configuration tab
Natural Gas Analyzers
33
Appendix D: Carrier Gas Type Configuration
6
Select Apply Configuration. The new configuration is sent to
the instrument as shown in Figure 32
Figure 32 Sending configuration to instrument
7
When the configuration is complete, in the Reboot Instrument
dialog box select OK. See Figure 33
Figure 33 Request after configuration change
8
Turn off the instrument.
9
Change the carrier gas on the instrument.
10 Restart the Agilent 490 Micro GC - Natural Gas Analyzer.
The Agilent 490 Micro GC is now configured for carrier gas
Argon.
Natural Gas Analyzers
34
Agilent 490 Micro GC Natural Gas Analyzer
User Manual
Appendix E: Method for CP-Molsieve
5A Channel with Carrier Gas Argon
Typical method setting for analysis of helium and hydrogen on
the CP-Molsieve 5A channel.
Table 5
Method setting for analysis of helium with Natural Gas
Analyzer B Extended
Method settings
CP-Molsieve 5A
Carrier gas
Argon
Injector temperature (°C)
110
Injection time (ms)
40
Backflush time (s)
11
Column temperature (°C)
80
Pressure (kPa)
200
Sample line temperature (°C)
110
Invert signal
Yes
Agilent Technologies
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Agilent Technologies
© Agilent Technologies, Inc.
Printed in USA, May 2012
*G3582-90002*
G3582-90002
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